V.S Kortov

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Publications (1)0 Total impact

  • Article: Photoluminescence and thermoluminescence of titanium ions in sapphire crystals
    G Molnár, M Benabdesselam, J Borossay, D Lapraz, P Iacconi, V.S Kortov, A.I Surdo
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    ABSTRACT: Several titanium species (Ti3+, Ti4+, Ti4+-VAl clusters) were identified in sapphire samples from their optical spectra. In highly reduced samples, we observed only Ti3+ centres while oxidized samples contain Ti3+ and Ti4+ ions as well. The formation of Ti4+ ions occurs simultaneously with the formation of aluminium-vacancies which are charge compensators for Ti4+ ions and act as hole traps in charge exchange process. We could observe locally and non-locally compensated Ti4+ as well. It is shown that Ti3+ is a deep hole trap while Ti4+ is a deep electron trap. In the TL process they act as recombination centers for electrons and holes, respectively. However, in TL we observed only the emission of locally compensated Ti4+, probably because of spatial correlation.
    Radiation Measurements.
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